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nfqws2, zapret-lib: more gzip optimizations

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bol-van
2026-01-07 08:09:41 +03:00
parent e6591575fe
commit b699e5d9ec
2 changed files with 14 additions and 11 deletions
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16
lua/zapret-lib.lua
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@@ -1436,13 +1436,15 @@ function is_gzip_file(filename)
f:close()
return hdr and hdr=="\x1F\x8B"
end
-- ungzips file to raw string
function gunzip_file(filename, read_block_size)
-- ungzip file to raw string
-- expected_ratio = uncompressed_size/compressed_size (default 4)
function gunzip_file(filename, expected_ratio, read_block_size)
local f, err = io.open(filename, "r")
if not f then
error("gunzip_file: "..err)
end
if not read_block_size then read_block_size=16384 end
if not expected_ratio then expected_ratio=4 end
local decompressed=""
gz = gunzip_init()
@@ -1460,7 +1462,7 @@ function gunzip_file(filename, read_block_size)
return nil
end
end
local decomp, eof = gunzip_inflate(gz, compressed)
local decomp, eof = gunzip_inflate(gz, compressed, #compressed * expected_ratio)
if not decomp then
f:close()
gunzip_end(gz)
@@ -1472,15 +1474,17 @@ function gunzip_file(filename, read_block_size)
gunzip_end(gz)
return decompressed
end
-- zips file to raw string
-- zip file to raw string
-- expected_ratio = uncompressed_size/compressed_size (default 2)
-- level : 1..9 (default 9)
-- memlevel : 1..8 (default 8)
function gzip_file(filename, data, level, memlevel, compress_block_size)
function gzip_file(filename, data, expected_ratio, level, memlevel, compress_block_size)
local f, err = io.open(filename, "w")
if not f then
error("gzip_file: "..err)
end
if not write_block_size then compress_block_size=16384 end
if not expected_ratio then expected_ratio=2 end
gz = gzip_init(nil, level, memlevel)
if not gz then
@@ -1490,7 +1494,7 @@ function gzip_file(filename, data, level, memlevel, compress_block_size)
repeat
block_size = #data-off+1
if block_size>compress_block_size then block_size=compress_block_size end
local comp, eof = gzip_deflate(gz, string.sub(data,off,off+block_size-1))
local comp, eof = gzip_deflate(gz, string.sub(data,off,off+block_size-1), block_size / expected_ratio)
if not comp then
f:close()
gzip_end(gz)